SV-220936r971535: Kerberos encryption types must be configured to prevent the use of DES and RC4 encryption suites. | Microsoft Windows 10 STIG SCAP Benchmark

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Assessment Title

Rule Text

Kerberos encryption types must be configured to prevent the use of DES and RC4 encryption suites.

Description

Discussion Text

Certain encryption types are no longer considered secure. This setting configures a minimum encryption type for Kerberos, preventing the use of the DES and RC4 encryption suites.

How this relates to the STIG checklist: STIG vs SCAP benchmark.

IA Controls

NIST SP 800-53

Not mappedCCI-000803SV-78285V-63795

References

DPMS Target Microsoft Windows 10 DISA DPMS Target Microsoft Windows 10 4072

SCC Automation Reference

The reconstructed evaluation script behind this rule's OVAL check(s) — every module a compound check combines, with this rule's own concrete values and DISA's SCC tool's real per-module mechanism curated from static teardown of SCC releases.

# Windows PowerShell
# Reconstructed from oval:mil.disa.stig.windows10:def:220936
# Kerberos encryption types must be configured to prevent the use of DES and RC4 encryption suites.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# Verifies 'Network Security: Configure encryption types allowed for Kerberos' is set to 'Enabled' with 'AES128_HMAC_SHA1', 'AES256_HMAC_SHA1', 'Future encryption types'
# registry_object (registry_test)
function test_1 {
  return (((@{String='reg_sz';ExpandString='reg_expand_sz';Binary='reg_binary';DWord='reg_dword';MultiString='reg_multi_sz';QWord='reg_qword';None='reg_none'}[(Get-Item -Path 'Registry::HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\Kerberos\Parameters').GetValueKind('SupportedEncryptionTypes').ToString()]) -eq 'reg_dword') -and (((Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\Kerberos\Parameters' -Name 'SupportedEncryptionTypes' -ErrorAction SilentlyContinue) | Select-Object -ExpandProperty 'SupportedEncryptionTypes') -eq 2147483640))
}

if (test_1) {
  Write-Output "PASS"
} else {
  Write-Output "FAIL"
}

Assessment Script Powered by AISyntax-verified

A standalone PowerShell script to assess this control automatically. Review before running it in your environment.

Syntax-checked as valid PowerShell. Not executed here — running it for real needs the actual ms_windows_10 target this check assesses.

# OVAL Definition: oval:mil.disa.stig.windows10:def:220936
$regPath = "HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\Kerberos\Parameters"
$regKey = "SupportedEncryptionTypes"
$regValue = 2147483640
$compliant = (Test-Path $regPath) -and (Get-ItemProperty -Path $regPath -Name $regKey -ErrorAction SilentlyContinue).$regKey -eq $regValue
if ($compliant) {Write-Output "PASS"; exit 0} else {Write-Output "FAIL"; exit 1}

Remediation

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> Security Options >> "Network security: Configure encryption types allowed for Kerberos" to "Enabled" with only the following selected:

AES128_HMAC_SHA1
AES256_HMAC_SHA1
Future encryption types